Rasp.



UNITED STATES PATENT OFFICE.

LOUIS BERGER, OF LAUSANNE, SWITZERLAND.

RAS P.

SPECIFICATION forming part of Letters Patent N o. 684,171, dated October 8, 1901'.

Application filed March 15, 1901- Scrial No. 51,249. (No model.)

To @ZZ when?, it 17mg/ concern:

Beit known that I, LOUIS BERGER, merchant, a citizen of the Republic of Switzerland, residing at Lausanne, Switzerland, have invented certain new and useful Improve-` ments in Rasps, of which the following is a specication.

The invention relates to certain improvements in rasps of that class in which a solid and rigid back piece of suitable material is combined with a thin rasp-blade adapted to be removed therefrom when it is desired to replace or chan ge the cutting-surface, according to the nature of the work to be done or when the said rasp-blade is worn out; and the invention consists of the combination, with a rasp-blade provided with two holes, of a fixed projection at the one end of the solid and rigid hack piece and of a projection fixed eccentrically to a rotative device (for instance, a shaft or pivoted lever) provided at the other end of the said solid and rigid back piece.

The invention further comprises a new construction of rasp-blades intended to be xed to the said back piece, said construction consisting in providing the said blades with suitable sharp-edged projections formed each of a stamped-out and suitably-bent-up portion of the said blade,

In the accompanying drawings, which form a part of the present application for patent, Figure l is a longitudinal section of one construction embodying the invention. Fig. 2

is a front View of a portion of the back piece of the rasp shown in Fig. l before the raspblade has been putin place, the latter being shown in dotted lines in position for being locked. Fig. 3 is a front view of the rasp shown in Fig. 1. Fig. Ltisa longitudinal section of another construction embodying the invention, and Fig. 5 is a front view of the same. Fig. G is a longitudinal section of a further modification of the invention, and Fig. 7 is a front view of the corresponding back piece before the rasp-blade has been put on.

In the several Iigures of the drawings the same letters of reference refer to the same parts.

d is the rasp-blade, formed of a suitable sheet of steel and provided with sharp-edged projections l), each formed of a stamped-out portion of the said blade bent up so as to form the cutting edges of the rasp-blade. The form and configuration of each such sharpedged projections may vary according to the work to be done. Figs. 1 to 3 show4 one form of such projections, and Figs. 4 to 6 show another form of same. The thin rasp-blade is provided at each end with a suitable hole h and t', respectively, into one of which engages a projection d, fixed to one end of the solid and rigid back piece c, while the other one is intended to receive the projection e, fixed eccentrically to a rotative device provided at the other end of said back piece. In Figs. 1 to 3 the said rotative device is formed of a stern or shaft f, to which is fixed on the one hand the eccentrical pin or projection e and on the other hand the lever g, which may be rocked from the position shown in Fig. 2 into the position shown by dotted lines in Fig. 3. It will easily be seen that when in the first of these positions the eccentrical pin or projection e allows the blade a to be engaged over both projections d and e notwithstanding the inclined position of the same, but that when thrown from the position of Fig. 2 into that of Fig. 3 the inclined pin e will engage the lower edge of the hole 11 of blade ct and firmly fix the latter to the back piece c.

In Figs. 4 and 5 rotative shaft f, bearing the eccentrical pin e, is provided with a handle or button lc instead of being provided with a lever g; but it works exactly in the same manner as in the first construction shown. Again, in Figs. 6 and 7 the rotative device is formed of a lever l, pivoted to the solid and rigid back piece c by means of a pivot-screw m and bearing the eccentrical pin or projection e. in exactly the same manner as the one already described.

IIaving thus fully described my invention, I claiml. In rasps of that class in which a solid and rigid back piece of suitable material is combined with a thin rasp-blade adapted to be removed therefrom, the combination of a rasp-blade having one hole at each of its ends with a solid and rigid back piece having at one of its ends afixed projection intended This device also works IOO to engage one of the said holes and at its other end a rotative device having an eccentrical projection intended to engage the other of the said holes, substantially as shown and described` 2. In rasps of that class in which asolid and rigid back piece of suitable material is combined with a thin rasp-blade adapted to be removed therefrom, the combination of a rasp-blade having one hole at each of its ends with a solid and rigid back piece having at one of itsends a fixed inclined projection d intended to engage one of the said holes and at its other end a rotative shaftf having an eccentrioal inclined projection e intended to engage the other of the said holes, substantially as shown and described.

3. In rasps of that class in which a solid centrical projection e intended to engage the i Y other of the said holes, substantially as shownand described.

In testimony that I claim the foregoing as my invention I have signed myname in pres- Y ence o'f two subscribing Witnesses.

LOUIS BERGER. Witnesses:

E. HIER-SCHNEIDER, TH. IMER. 

